KNOWN INFO                         TEST OPTIONS            Remove and inspect     REASON FOR QUESTION                 KNOWN INFO                  REASON FOR QUESTION     Visual inspection            TEST OPTIONS            NO YES YES NO        POSSIBLE PROBLEMS        4. Fuel OK. Oil level OK. Air cleaner OK. Air system OK. Fuel hoses OK. No air in fuel system. Fuel filters clean.        POSSIBLE PROBLEMS        3. a12. LOW ENGINE POWER (CONT) Fuel OK. Oil level OK. Air cleaner OK. Air system OK. Fuel hoses OK. No air in fuel system. Dirty fuel filters. Faulty fuel pressure regulating valve. Restricted or damaged fuel filter. Faulty fuel governor. Are fuel/water separator filter and fuel filter clean and clear of debris? Replace fuel/water separator filter (para 4-13) and/or fuel filter (para 4-14). Dirty or clogged fuel/water separator filter and/or fuel filter will cause low engine power. A defective or leaking fuel pressure regulating valve will cause low engine power. Is fuel pressure regulating valve free from leaks or damage? Replace fuel pressure regulating valve (para 4-3). TM 9-2320-365-20-1 2-100.2          Change 1 Faulty fuel pressure regulating valve. Restricted or damaged fuel filter. Faulty fuel governor.